/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jute;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.List;
import java.util.Stack;
import java.util.TreeMap;

/**
 *
 */
class XmlOutputArchive implements OutputArchive {

	static XmlOutputArchive getArchive(OutputStream strm) {
		return new XmlOutputArchive(strm);
	}

	private Stack<String> compoundStack;

	private int indent = 0;

	private PrintStream stream;

	/** Creates a new instance of XmlOutputArchive */
	public XmlOutputArchive(OutputStream out) {
		stream = new PrintStream(out);
		compoundStack = new Stack<String>();
	}

	private void addIndent() {
		indent++;
	}

	private void closeIndent() {
		indent--;
	}

	public void endMap(TreeMap v, String tag) throws IOException {
		closeIndent();
		putIndent();
		stream.print("</array>");
		outsideMap(tag);
	}

	public void endRecord(Record r, String tag) throws IOException {
		closeIndent();
		putIndent();
		stream.print("</struct>");
		outsideRecord(tag);
	}

	public void endVector(List v, String tag) throws IOException {
		closeIndent();
		putIndent();
		stream.print("</array>");
		outsideVector(tag);
	}

	private void insideMap(String tag) {
		printBeginEnvelope(tag);
		compoundStack.push("map");
	}

	private void insideRecord(String tag) {
		printBeginEnvelope(tag);
		compoundStack.push("struct");
	}

	private void insideVector(String tag) {
		printBeginEnvelope(tag);
		compoundStack.push("vector");
	}

	private void outsideMap(String tag) throws IOException {
		String s = compoundStack.pop();
		if (!"map".equals(s)) {
			throw new IOException("Error serializing map.");
		}
		printEndEnvelope(tag);
	}

	private void outsideRecord(String tag) throws IOException {
		String s = compoundStack.pop();
		if (!"struct".equals(s)) {
			throw new IOException("Error serializing record.");
		}
		printEndEnvelope(tag);
	}

	private void outsideVector(String tag) throws IOException {
		String s = compoundStack.pop();
		if (!"vector".equals(s)) {
			throw new IOException("Error serializing vector.");
		}
		printEndEnvelope(tag);
	}

	private void printBeginEnvelope(String tag) {
		if (!compoundStack.empty()) {
			String s = compoundStack.peek();
			if ("struct".equals(s)) {
				putIndent();
				stream.print("<member>\n");
				addIndent();
				putIndent();
				stream.print("<name>" + tag + "</name>\n");
				putIndent();
				stream.print("<value>");
			} else if ("vector".equals(s)) {
				stream.print("<value>");
			} else if ("map".equals(s)) {
				stream.print("<value>");
			}
		} else {
			stream.print("<value>");
		}
	}

	private void printEndEnvelope(String tag) {
		if (!compoundStack.empty()) {
			String s = compoundStack.peek();
			if ("struct".equals(s)) {
				stream.print("</value>\n");
				closeIndent();
				putIndent();
				stream.print("</member>\n");
			} else if ("vector".equals(s)) {
				stream.print("</value>\n");
			} else if ("map".equals(s)) {
				stream.print("</value>\n");
			}
		} else {
			stream.print("</value>\n");
		}
	}

	private void putIndent() {
		StringBuilder sb = new StringBuilder("");
		for (int idx = 0; idx < indent; idx++) {
			sb.append("  ");
		}
		stream.print(sb.toString());
	}

	public void startMap(TreeMap v, String tag) throws IOException {
		insideMap(tag);
		stream.print("<array>\n");
		addIndent();
	}

	public void startRecord(Record r, String tag) throws IOException {
		insideRecord(tag);
		stream.print("<struct>\n");
		addIndent();
	}

	public void startVector(List v, String tag) throws IOException {
		insideVector(tag);
		stream.print("<array>\n");
		addIndent();
	}

	public void writeBool(boolean b, String tag) throws IOException {
		printBeginEnvelope(tag);
		stream.print("<boolean>");
		stream.print(b ? "1" : "0");
		stream.print("</boolean>");
		printEndEnvelope(tag);
	}

	public void writeBuffer(byte buf[], String tag) throws IOException {
		printBeginEnvelope(tag);
		stream.print("<string>");
		stream.print(Utils.toXMLBuffer(buf));
		stream.print("</string>");
		printEndEnvelope(tag);
	}

	public void writeByte(byte b, String tag) throws IOException {
		printBeginEnvelope(tag);
		stream.print("<ex:i1>");
		stream.print(Byte.toString(b));
		stream.print("</ex:i1>");
		printEndEnvelope(tag);
	}

	public void writeDouble(double d, String tag) throws IOException {
		printBeginEnvelope(tag);
		stream.print("<double>");
		stream.print(Double.toString(d));
		stream.print("</double>");
		printEndEnvelope(tag);
	}

	public void writeFloat(float f, String tag) throws IOException {
		printBeginEnvelope(tag);
		stream.print("<ex:float>");
		stream.print(Float.toString(f));
		stream.print("</ex:float>");
		printEndEnvelope(tag);
	}

	public void writeInt(int i, String tag) throws IOException {
		printBeginEnvelope(tag);
		stream.print("<i4>");
		stream.print(Integer.toString(i));
		stream.print("</i4>");
		printEndEnvelope(tag);
	}

	public void writeLong(long l, String tag) throws IOException {
		printBeginEnvelope(tag);
		stream.print("<ex:i8>");
		stream.print(Long.toString(l));
		stream.print("</ex:i8>");
		printEndEnvelope(tag);
	}

	public void writeRecord(Record r, String tag) throws IOException {
		r.serialize(this, tag);
	}

	public void writeString(String s, String tag) throws IOException {
		printBeginEnvelope(tag);
		stream.print("<string>");
		stream.print(Utils.toXMLString(s));
		stream.print("</string>");
		printEndEnvelope(tag);
	}

}
